Kim Hyung Tak’s intellectual property is protected internationally. Downloading a scanned, unlicensed PDF is piracy. The archery community is small; supporting illegal copies hurts the sport and discourages top coaches from publishing their work in English.
If you are a student, many university sports science libraries have purchased rights to the Korean Coaching Certification textbooks. You can sometimes find English summaries of Kim’s work in the "International Journal of Sport Biomechanics."
The "free PDFs" floating around are usually:
Instead of googling try this approach:
If you are searching for this PDF, you are likely hoping to find detailed explanations of the Korean style. Based on seminar notes and previews of his legitimate works, here is what the fabled book typically contains:
As of this article’s publication, there is of Kim Hyung Tak’s complete archery manual. This scarcity is precisely why the "PDF" search is so popular.